Follow-up to: 
- https://github.com/zed-industries/zed/pull/43436
- https://github.com/zed-industries/zed/pull/42831

The changes in #42831 resulted in a regression where environment
variables in the Server Info view were no longer redact. The changes in
#43436 were insufficient as I was still seeing sensitive values in
Nightly e6fe95b4f2f676c7fc4a5f951ba7c721e7d22e8a (which includes
#43436).

CC: @SomeoneToIgnore (Hi! 👋 Thanks for keeping this redaction
functionality alive)

Release Notes:

- N/A